I thought I had recovered my necklaces last night but I was mistaken. Sheldon started scratching around the vacuum cleaner, trying to get something underneath it. I went over thinking "aha, caught you, you little #$#!" but when I moved the vacuum the only thing under it was 6-8 treats he'd hidden away from his brothers. He's the only one who isn't afraid of the vacuum, so I guess this hiding spot was pretty well chosen. Still wish I knew were my necklaces were, though.